Body Builder (beta)
CodingOpenRouter · Released December 2025
Transform your natural language requests into structured OpenRouter API request objects. Describe what you want to accomplish with AI models, and Body Builder will construct the appropriate API calls.
It is an OpenRouter router rather than a model — it dispatches each request to an underlying model, so its cost and capabilities vary with the destination.
Facts and pricing
- Provider
- OpenRouter
- Context window
- 128K tokens
- Input price
- -1.2e+7 credits / 1M tokens ($-1.0e+6 raw)
- Output price
- -1.2e+7 credits / 1M tokens ($-1.0e+6 raw)
- Vision (image input)
- No
- Tool calling
- No
- Extended reasoning
- No
Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin. Raw prices shown per 1M tokens.
What Body Builder (beta) is best for
- Writing, reviewing and refactoring code; agentic coding workflows
Example prompts
Prompts that suit a coding model like Body Builder (beta):
- Refactor this function to be testable and write the tests
- Explain what this regex does and rewrite it to be readable
- Design a database schema for a multi-tenant invoicing app
- Review this pull request diff for correctness and edge cases
OpenRouter family
| Model | Context | Input cr/M | Output cr/M | Released |
|---|---|---|---|---|
| Auto Router (Beta) | 2M | -1.2e+7 | -1.2e+7 | July 2026 |
| Fusion | 1M | -1.2e+7 | -1.2e+7 | June 2026 |
| Pareto Code Router | 2M | -1.2e+7 | -1.2e+7 | April 2026 |
| Free Models Router | 200K | 0 | 0 | February 2026 |
| Body Builder (beta) | 128K | -1.2e+7 | -1.2e+7 | December 2025 |
| Auto Router | 2M | -1.2e+7 | -1.2e+7 | November 2023 |
Model comparisons
- Claude Opus 5.5 vs Claude Opus 5
- Claude Opus 5.5 vs GPT-6 Astra
- Claude Opus 5.5 vs GPT-6 Sol
- Claude Opus 5.5 vs Claude Sonnet 5
Frequently asked questions
- What is Body Builder (beta)?
- Body Builder (beta) is an AI model by OpenRouter. Transform your natural language requests into structured OpenRouter API request objects. Describe what you want to accomplish with AI models, and Body Builder will construct the appropriate API calls.
- How much does Body Builder (beta) cost on Zeplik?
- Input tokens cost -1.2e+7 credits per million and output tokens -1.2e+7 credits per million (1 credit = $0.10; the raw provider rates are $-1.0e+6 and $-1.0e+6 per million). New accounts start with free credits.
- How long can a conversation with Body Builder (beta) be?
- Body Builder (beta) has a 128K-token context window (128,000 tokens), which covers the conversation plus any documents you attach.
- Does Body Builder (beta) support images and tools?
- Body Builder (beta) is text-only and does not support tool calling.
Related models
The experimental version of our Auto Router where we test new improvements.
Fusion turns your prompt into a small multi-model deliberation.
The Pareto Router maintains a tiered shortlist of strong coding models, ranked by [Artificial Analysis](https://artificialanalysis.ai/) coding percentiles.
The simplest way to get free inference. openrouter/free is a router that selects free models at random from the models available on OpenRouter.
The Auto Router automatically selects the best model for your prompt, powered by the wisdom of the market.
Ripple-65B-Preview by ricursiveAI, a 65B model with native tool calling, served in BF16.
More you can do with Body Builder (beta)
- 468 AI skillsReady-to-run expert methods for writing, data, code and more, each running on Body Builder (beta) or any model you pick.
- 997 integrationsConnect Gmail, Slack, GitHub, Notion and hundreds more so the assistant can work in your apps.
- Simple pricingPlus, Pro and Max plans with a monthly credit allowance that works across every model.